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Re: [Qemu-devel] 64bit guest hangs while migrating


From: Stefan Priebe
Subject: Re: [Qemu-devel] 64bit guest hangs while migrating
Date: Mon, 24 Dec 2012 15:17:26 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/17.0 Thunderbird/17.0

While testing this again i also had 32bit guests where migrate didn't work - kvm source process just eats all CPU.

Stefan
Am 24.12.2012 00:18, schrieb Stefan Priebe:
Hello list,

i'm using qemu v1.3.0. Since upgrading from kvm qemu 1.2 my 64bit linux
guests hang while online migrating.

Has anybody an idea / can help?

Things happing while this happens:
- kvm process uses 100%CPU
- human monitor does not work as the process does not respond at/on socket
- strace of kvm process look like this:
..............................................
[pid 28351] futex(0x7ff8b8025388, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 28351] futex(0x7ff8b8026024,
FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 11801, {1356016143,
843092000}, ffffffff <unfinished ...>
[pid 28285] mremap(0x7ff77bfe4000, 160378880, 160411648, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160411648, 160448512, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160448512, 160481280, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160481280, 160514048, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160514048, 160546816, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160546816, 160583680, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160583680, 160616448, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160616448, 160649216, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160649216, 160681984, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160681984, 160718848, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160718848, 160751616, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160751616, 160784384, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160784384, 160817152, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160817152, 160854016, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160854016, 160886784, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160886784, 160919552, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160919552, 160952320, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160952320, 160989184, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 160989184, 161021952, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161021952, 161054720, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161054720, 161087488, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161087488, 161124352, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161124352, 161157120, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161157120, 161189888, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161189888, 161222656, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161222656, 161259520, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161259520, 161292288, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161292288, 161325056, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28351] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed
out)
[pid 28351] futex(0x7ff8b8025388, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 28351] futex(0x7ff8b8026024,
FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 11803, {1356016144,
843283000}, ffffffff <unfinished ...>
[pid 28285] mremap(0x7ff77bfe4000, 161325056, 161357824, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161357824, 161394688, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161394688, 161427456, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161427456, 161460224, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28345] <... restart_syscall resumed> ) = -1 ETIMEDOUT (Connection
timed out)
[pid 28345] futex(0x7ff8caa2e274, FUTEX_CMP_REQUEUE_PRIVATE, 1,
2147483647, 0x7ff8caa2e1b0, 872) = 1
[pid 28347] <... futex resumed> ) = 0
[pid 28345] futex(0x7ff8caa241a8, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 28347] futex(0x7ff8caa2e1b0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 28345] <... futex resumed> ) = 0
[pid 28347] <... futex resumed> ) = 0
[pid 28345] futex(0x7ff8caa2420c,
FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 799, {1356016153,
954319000}, ffffffff <unfinished ...>
[pid 28347] sendmsg(19, {msg_name(0)=NULL, msg_iov(1)=[{"\t", 1}],
msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 1
[pid 28347] futex(0x7ff8caa2e274, FUTEX_WAIT_PRIVATE, 873, NULL
<unfinished ...>
[pid 28285] mremap(0x7ff77bfe4000, 161460224, 161492992, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161492992, 161529856, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161529856, 161562624, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161562624, 161595392, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161595392, 161628160, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161628160, 161665024, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161665024, 161697792, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161697792, 161730560, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161730560, 161763328, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161763328, 161800192, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161800192, 161832960, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161832960, 161865728, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161865728, 161898496, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
[pid 28285] mremap(0x7ff77bfe4000, 161898496, 161935360, MREMAP_MAYMOVE)
= 0x7ff77bfe4000
.........................................................................

32bit guests work fine.

Thanks!

Greets,
Stefan



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